Glass bait



Dag. 29.19.25.l 1,567,300

G. G. ROBERTS GLASS BAIT Filed May 1l, 1923 Patented Dec. 29, 1925.

UNITED STATES PATENT OFFICE.

GEORGE G. ROBERTS, OF WASHINGTON, DISTRICT OF COLUIVIBIAv ASSIGNOR TO THE `VIRGINIA PLATE GLASS CORPORATION,

rIBIA, A CORPORATION OF VIRGINIA.

`OF WASHINGTON, DISTRICT OF COLUM- GLASS BAIT.

Application led May 11, 1923. Serial No. 638,294.

To all whom t may con-cern:

Be it known that I, GEORGE Gr. ROBERTS, a citizen of the United States of America, and a resident ot VIVashington, District ot' Columbia, have invented certain new and useful Improvements in Glass Baits, ot which the following is a full and clear speciication.

In the drawing- Fig. l is a front elevation, partly broken away; and

F ig. 2 is a vertical sectional view of an apparatus embodying' my invention;

Fig. 3 is a detail transverse sectional view showing particularly the hinged clamp for locking the parts of the bait-bar together.

Referring to the drawing annexed by reference-characters, 5 designates two semicylindrical bars forming together the baitbar. These two bars are hinged together along their upper edges by means of pintles 6, so that the t-wo halves of the bar gravitate to closed position. Each bar is grooved lo-ngitudinally interiorly to form a bead-torm- 1 ing space 7, and the lower meeting-edges of the two halves of the bar are cut away to form a longitudinal slot 8 at the under side of the bait-bar. The ends of the slot 8 and bead-cavity 7 are closed by end-walls 9, which end-walls co-me together in contact when the hollow bait-bar is closed. The two sections 5 oft the bait-bar are each hollowed to form a wMer-circulating chamber 10.

The bait-bar is hung by means of its hinged lugs and pendent hooks 11 to a iirame-bar 12, which bar 12 is attached to t-he lower end of a lifting-bar 13. As usual in plate-glass drawing, suitable mechanism (not shown) is provided for slowly lifting the bait-bar after it has been lowered into contact with the molten mass of glass. Connected to one ot the halves of the bait-bar is a series of pipes 14 which connect, through cross-pipe 15, to a common pipe 16. The pipes 14 have communication with the beadcavity 7 so that, when suction is applied to the' common pipe 16, air will be exhausted from said bead-cavity and its connected slot 8.

In operation, the bait-bar is lowered in the usual manne-r until the lower edge of the bar is immersed in the molten glass, thus sealing the slot 8; then air is exhausted from After the the interior of the bait-bar by means of the plping, whereupon the molten glass is drawn up to ll the slot S and the cavity 7; then the bait is ready to be raised slowly in the usual manner. By this manner ot securing a connection between the plate and the bait, it will be observed that I insure a uniform, complete connection throughout the width of the plate and that, therefore, there is no danger of the plate pulling away from the bait during the lifting process. plate is drawn and the glass is cooled, the plate may be readily separated from the bait by simply swinging open the two halves ot the bait-bar on the hinges 6. The halves of the bait-bar come away from the glass clean in view of the fact that the glass not only contracts to a greater degree than the metal of the bait, but also contracts quicker; the bait is therefore in condition to be immediately used again for another drawing operation. It will be observed, therefore, that my form of bait-bar does away with the known objections to the usual solid bait-bar.

To insure the sections of the bait-bar being held closely together during the suction operation as well as the drawing opera tion, I provide one or more clamps 17, each of which consists of an arched member pivoted at 18, at one side of the bait, and adapted to swing over and down upon the closed sections and forcibly draw them together to as tight a fit along the meeting edges as is necessary.

What I claim is:

1'. A bait for drawing glass in plate forni consisting of a pair ot' separable sections pivoted together along their longitudinal edges and having a longitudinal slot between their lower meeting edges and an enlarged interior cavity extending the length of the slot, removable clamping means being employed to hold `the sections together in closed relation.

2. A bait for drawing glass in plate form consisting of a pair of sections semi-circular in cross-section hinged together along' their top sides and having a slot formed in its under side at the meeting-edges of the sections, removable clamping means being em ployed to hold the sections together in closed relation.

3. A bait for drawing glass in plate torni (itl consisting of a hollow bait-har constructed of a plurality of sections and having an entrance slot along its lower edge, and means for exhausting the air from the interior of the hait-har, removable clamping means being employed to hold the Sections together' in closed relation.

4. A bait for drawing glass in plate form consisting of a pair of separable sections pivoted together along their upper longitu` dinal edges and having a longitudinal slot between their lower meeting edges and an enlarged interior cavity extending the length of the slot, and a clamp p-ivoted to one of the sections and adapted to Swing over and embrace loot-h sections` andv serve to clamp them solidly together while in closed relation.

In testimony whereof I hereunto alix my Signature.

GEORGE e. ROBERTS. 

